Normally priced at $9.99 / £4.29 on Ubisoft’s store, the title is available free until January 23.
Originally released in 2006, it marked the debut of the Rabbids, who initially featured as antagonists in the Rayman series.
The game is being given away as part of Ubisoft’s Lunar Sale, which runs until February 1.
PC players can also currently download Epistory – Typing Chronicles free from the Epic Games Store until January 26.
Ubisoft announced last week that it had delayed Skull and Bones and cancelled three unannounced games.
It also said it was planning to strengthen its focus on its biggest brands and live services following weaker than expected software sales over the holiday season, when titles including Mario + Rabbids: Sparks of Hope and Just Dance 2023 failed to meet expectations.
Skull and Bones will now arrive “early” in Ubisoft’s next fiscal year, which runs from April until March 2024. During this period the company also plans to release Assassin’s Creed Mirage, Avatar: Frontiers of Pandora, “and other yet-to-be-announced premium games, including a large one, as well as promising free-to-play titles for some of our biggest brands”.